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At the instant theta=45 degrees, the boy with a mass of 75 kg, moves a speed of 6 m/s, which is increasing at .5 m/s^2. Neglect his size and the mass of the seat and chords. The seat is pin connected to the frame BC. Find the horizontal and vertical reactions of the seat on the boy.

At the instant theta=45 degrees, the boy with a mass of 75 kg, moves a speed of 6 m/s, which is increasing at .5 m/s^2. Neglect his size and the mass of the seat and chords. The seat is pin connected to the frame BC. Find the horizontal and vertical reactions of the seat on the boy.